Hi,

I suggest you to do like the bellow code by creating a computed field, adapt it as you need.

# Hide edit button
edit_hide_css = fields.Html(string='CSS', sanitize=False, compute='_compute_edit_hide_css')

@api.depends('state')
def _compute_edit_hide_css(self):
    for rec in self:
        if rec.state in ['done']:
            rec.edit_hide_css = '<style>.o_form_button_edit {display: none !important;}</style>'
        else:
            rec.edit_hide_css = False

Best regards!

Have a look at this module https://odoo-community.org/shop/product/web-action-conditionable-2608#attr=8636, you can set the attribute `edit` base on the value of a field